ShellMain.java
/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.test.services.shellexecutor;
import static android.os.Process.killProcess;
import static android.os.Process.myPid;
import android.util.Log;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;
/** Main runner class for the Shell Command Executor */
class ShellMain {
private static final String TAG = "ShellMain";
private static final ShellCommandExecutorServer server = new ShellCommandExecutorServer();
private ShellMain() {}
public static void main(String[] args)
throws IOException, InterruptedException, ExecutionException {
boolean cleanExit = "1".equals(System.getenv("SM_EXIT"));
String secretKey = server.start();
// Append the arguments for the binder key in the second last position, before the
// instrumentation itself.
ArrayList<String> argList = new ArrayList<>(Arrays.asList(args).subList(0, args.length - 1));
Collections.addAll(
argList, new String[] {"-e", ShellExecSharedConstants.BINDER_KEY, secretKey});
argList.add(args[args.length - 1]);
ProcessBuilder pb = new ProcessBuilder(argList);
final Process p = pb.start();
FutureTask<Void> stdoutCopier =
new FutureTask<>(
new Runnable() {
@Override
public void run() {
byte[] buf = new byte[ShellExecSharedConstants.BUFFER_SIZE];
InputStream stdout = p.getInputStream();
while (true) {
try {
int read = stdout.read(buf);
if (read == -1) {
System.out.close();
return;
}
System.out.write(buf, 0, read);
} catch (IOException e) {
Log.e(TAG, "IOException on stdout, terminating", e);
return;
}
}
}
},
null);
FutureTask<Void> stderrCopier =
new FutureTask<>(
new Runnable() {
@Override
public void run() {
byte[] buf = new byte[ShellExecSharedConstants.BUFFER_SIZE];
InputStream stderr = p.getErrorStream();
while (true) {
try {
int read = stderr.read(buf);
if (read == -1) {
System.err.close();
return;
}
System.err.write(buf, 0, read);
} catch (IOException e) {
Log.e(TAG, "IOException on stderr, terminating", e);
return;
}
}
}
},
null);
Runnable stdinCopier =
new Runnable() {
@Override
public void run() {
byte[] buf = new byte[ShellExecSharedConstants.BUFFER_SIZE];
OutputStream stdin = p.getOutputStream();
while (true) {
try {
int read = System.in.read(buf);
if (read == -1) {
stdin.close();
return;
}
stdin.write(buf, 0, read);
} catch (IOException e) {
Log.e(TAG, "IOException on stdin, terminating", e);
return;
}
}
}
};
Thread inputThread = new Thread(stdinCopier);
inputThread.setDaemon(true);
inputThread.start();
Thread outputThread = new Thread(stdoutCopier);
outputThread.setDaemon(true);
outputThread.start();
Thread errThread = new Thread(stderrCopier);
errThread.setDaemon(true);
errThread.start();
int exit = p.waitFor();
stdoutCopier.get();
stderrCopier.get();
if (cleanExit) {
// Sometimes the atexit handler may block (seems to be around binder thread shutdown).
// This makes us hang after system.exit and our process sticks around blocking everyone.
// See b/73514868
// Let the kernel be our 介錯人
killProcess(myPid());
}
System.exit(exit);
}
}